| From: |
| Stefan Hajnoczi <stefanha-AT-redhat.com> |
| To: |
| linux-fsdevel-AT-vger.kernel.org |
| Subject: |
| [PATCH v2 0/3] virtiofs: export filesystem tags through sysfs |
| Date: |
| Thu, 08 Feb 2024 14:32:08 -0500 |
| Message-ID: |
| <20240208193212.731978-1-stefanha@redhat.com> |
| Cc: |
| Alyssa Ross <hi-AT-alyssa.is>, gmaglione-AT-redhat.com, virtio-fs-AT-lists.linux.dev, vgoyal-AT-redhat.com, mzxreary-AT-0pointer.de, Greg KH <gregkh-AT-linuxfoundation.org>, miklos-AT-szeredi.hu, Stefan Hajnoczi <stefanha-AT-redhat.com> |
| Archive-link: |
| Article |
v2:
- Vivek mentioned that he didn't have time to work on this patch series
recently so I gave it a shot.
- Information is now exposed in /sys/fs/virtiofs/ whereas before it was part of
the generic virtio device kobject, which didn't really fit.
Userspace needs a way to enumerate available virtiofs filesystems and detect
when they are hotplugged or unplugged. This would allow systemd to wait for a
virtiofs filesystem during boot, for example.
This patch series adds the following in sysfs:
/sys/fs/virtiofs/<n>/tag - unique identifier for mount(8)
/sys/fs/virtiofs/<n>/device - symlink to virtio device
A uevent is emitted when virtiofs devices are hotplugged or unplugged:
KERNEL[111.113221] add /fs/virtiofs/2 (virtiofs)
ACTION=add
DEVPATH=/fs/virtiofs/2
SUBSYSTEM=virtiofs
TAG=test
KERNEL[165.527167] remove /fs/virtiofs/2 (virtiofs)
ACTION=remove
DEVPATH=/fs/virtiofs/2
SUBSYSTEM=virtiofs
TAG=test
Stefan Hajnoczi (3):
virtiofs: forbid newlines in tags
virtiofs: export filesystem tags through sysfs
virtiofs: emit uevents on filesystem events
fs/fuse/virtio_fs.c | 138 +++++++++++++++++---
Documentation/ABI/testing/sysfs-fs-virtiofs | 11 ++
2 files changed, 128 insertions(+), 21 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-fs-virtiofs
--
2.43.0
